Don't know if this is old hat but.... I was really happy to experience the additional benefit of my recently received MFC 101 by attaching my volume pedal. It adds another dimension to controlling volume in addition to the standard guitar vol knob for pickup output vs. the Axe FX output vs. amp/speaker output. Definitely helps a lot in finding that sweet spot remotely (without affecting the green / yellow / red output indicators that the guitar volume knob always does). Not sure why that is - but it sure is a welcome plus in addition to the MFC functionality of switching various effects and settings remotely on the Axe FX.